Download - Vail o or Presentation 2004
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Radiator Products, Inc.
Presentation by
VASANTH Vailoorof TRP Inc.
Nov - 2004
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Product Testing LabProduct Testing Lab
Need Recognized Over Two Years Ago
Characterize performance of Cooling Systems
Identify variables
Develop more effective products
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Engineering/Product DevelopmentEngineering/Product Development
Heat Transfer Expert Hired mid-2003
Lab Operational since January 2004
Phase One - Focus on baseline & Comparative Test Data
Aggressive Schedule
Phase Two - Product Enhancements and New Product
Development
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TestingTestingSchematicSchematic
101
105
100
104
106
107
103
102
Sketch not to Scale
Heater Tank
Radiator
108 to 115
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Association with External AgencyAssociation with External Agency
Diagnostic Solutions Condition Appraisal
Cooling SystemsFailure Analysis
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Laboratory facility: StateLaboratory facility: State--ofof--thethe--artart
The Heating Chamber
Flexible connectors
Adequate Heaters
The Test Articles
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The Monitoring and Control SystemThe Monitoring and Control System
64 Channels of Thermocouples
4 Thermalwells
LabView Software
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2 Energy metersThe Monitoring and Control System (contd)The Monitoring and Control System (contd)
2 Variacs
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Steady State ModelSteady State Model
Q = U*A*T - - - - (1)
Q and T are measured
A is a relatively simple calculated geometric factor
Determining the U or the heat transfer coefficient isthe final objective of this exercise
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Temperature ApproximationTemperature Approximation
))T)/(TTln((T
)T(T)T(TT
AmbAirBotOilHotAirTopOil
AmbAirBotOilHotAirTopOil
LM
=
- - (2)
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Steady State VerificationSteady State Verification
Temperature vers us Ti me
38.75
38.80
38.85
38.90
38.95
39.00
39.05
0 200 400 600 800 1000
T ime in s econds
Tempera
tureinC
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Heat Dissipation CurveHeat Dissipation Curve
Heat dissipated Q versus TAvg
0
2500
5000
7500
10000
12500
0 10 20 30 40 50 60 70
TAvg[C]
Heatdis
sipated,
Q[W]
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Heat Transfer CoefficientHeat Transfer Coefficient
Heat transfer Coefficient U versus
TAv g
y = 8.653E-03x + 7.108E-01
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
0 10 20 30 40 50 60 70
TAvg[C]
Heattransfercoefficient,U
[W*ft-2*C-1]
U = 8.653E-03*TAvg + 7.108E-01
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The Transient TestThe Transient Test
The transient test consists of two parts.
a) The Ramp test and
b) The Decay test
Q = m*Cp*(T/t) - - - - (3)
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The Transient Test (contd)The Transient Test (contd)
T = T0*(1-exp*t) - - - - (4)
= m*Cp/(U*A) - - - - - (5)
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The logThe log--log plot for Ulog plot for U
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Performance TablePerformance Table
Summary
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Summary (contd)Summary (contd)
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Manifolds for mounting Multiple RadiatorsManifolds for mounting Multiple Radiators
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Compare 15 and 520mm wide RadiatorsCompare 15 and 520mm wide Radiators
Reasons
a) Reduced plate spacing
b) End effects of finning
c) Smaller diameter of header
d) Oil passage / Oil holding capacity
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Initial Test ResultsInitial Test Results
19 Gage vs 18 Gage
15 Wide TRP Radiators have better HeatDissipation Characteristics than 520mm
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RecapRecap
Factors affecting the amount of heat dissipated
Width
Length/Height
Number of Plates
Header Size
Oil flow Capacity
Empty weight
Heat transfer area
Distance between plates
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Further DiscussionsFurther Discussions
QuestionsQuestions